Wednesday, April 21, 2010

Quick hacks: webnumbr for fast scraping (of a single number)

Like the previous quick hack, I had little to do with this -- just demonstrating a tool. In this case, the goal was to graph the national average for certificate of deposit interest rates over time (you can find this information at Bankrate.com). At SHDH37, Drew told me about webnumbr which does exactly this (and was possibly developed at a previous SHDH) -- you pick a webpage and then select a single element from that page. webnumbr will scrape the webpage at an interval of your choosing and graph the data. I'm not wild about their graphing (prefer something interactive like this or Google Charts) but it looks like you can get the raw data in various formats (CSV, etc.) which would let you use other graphing methods, overlay charts, etc.

If you're interested, here are graphs for the average 1-year and 2-year CD rates.

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